REMOVE

1. Portrait photographs
2. Acetate negatives
3. Photographers.
4. Library of Congress Prints a …
5. Unknown
6. 1942

WHAT

1. Acetate negatives (1)
2. Photographs (1)
3. Portrait photographs (1)
4. negative (1)

WHO

1. Library of Congress Print … (1)

WHEN

1. 1911 (1)
2. between 1911 and 1942 (1)